Electricity counter



Oct. 23, 1923.

K. R. IHAMUCTILA ELECTRICITY COUNTER Filed Jan. 31. 1921 Patented c. 23, w23. I

PATENT OFFICE.

KARL R. IHAIUOTILA, 0F HELSINGFOBS, FINLAND.

ELECTRICITY COUNTER.

Application led January 31, 1921.

To w/wm z't may concem:

Be it known that I, KARL RICHARD IHAM- UOTILA, a citizen of Finland, residing at Helsingfors, iFinland, have invented cer- 5 tain new and useful Improvements in Electricity Counters (for which I'have filed application in Germany Jan. 3, 1919), of which the following is a specification.

My invention relates to testing apparatuses 10 and more particularly apparatuses for testing electricity meters. The object of my invention is to produce a testlng 'apparatus of this kind, whereby the testing operation may be greatly facilitated and the time for performing the test considerably shortened. My new apparatus is both simple 1n construction and operation.

, 0n the accompanying drawing on which my. apparatus is diagrammatically illustrated, the electricity .meter to be tested is shown at f. On the axisv h of this meter I secure .a contact arm g which once during every revolution of the axis h closes the electric circuit of an inductance coil In order to avoid friction, the point of the contact Iarm g passes between the contacts of the said circuit without touching the same. However, every time the point of the contact arm g passes between the said contacts, the electric circuit is closed by a spark transmitted by the point of the contactarm g from one contact to the other. As the spark passes, the air in the narrow gap between the two carbon plates c becomes conductive closing the elect-ric circuit of a galvanometer m, which thereby receives an impulse. fn. and s are respectively the northand south pole of the magnetic field. On the axis of n the galvanometer m is mounted a mirror b which upon every impulse received by the galvanometer m is deflected so as tov receive a ray of light from a lamp a. From the p mirrow b this ray of light is refiected uponA a rotating mirror c whereby, in turn, the

ray of light is thrown onto a scale d. The

miror c 1s carried by the axis of a normal meter e, rotating with the an ar velocity, which the meter to be tested 1s sipposed to B0 have under a predetermined loa semi mi. 441,461.

of the axis h of the meter f either will appear always on the same division mark of.

the scale d, in which case the meter f runs normal, or will appear to the right or the left of the said mark according to whether the meter f is too fast or too slow. This deviation, however slight, will be immediately indicated by the scale d.

It is, of course, not necessary that the mirrors b and c rotate at the same speed. It is sufficient, if the rotation of mirror b bears some fixed relation to the rotation of miror c.

If the meter e carrying the mirror'c runs at the definite rate of say one revolution per Second, for instance, the period of time of each revolution of the meter f to be tested can also be exactly determined up to a minute fraction of a second. The scale d having a fixed length, the period of time of each revolution of the meter f can readily be determined by the deviation of the light ray from the said division mark on the scale.

Z is a time-relay in the galvanometer circuit, for opening the same.

I claim as my invention:

1. Apparatus for testing electricity meters, and the like, comprising in combination with the rotatable laxis of the said meter a contact arm mounted on said axis, an electric circuit, an inductance coil therein, two contacts in the said` circuit with a spark gap between them adapted to be periodically bridged by the said contact arm to form a spark,- a supplementary circuit adapted to be closed upon the said first Vmentioned circuit being closed by the spark, a galvanometer included in the said supplementary circuit, a source of light, a mirror carried b the said galvanometer and periodically de ected therewith, so as to receive a ray of light from the said source of light, a second mirror revolving at a constant predetermined rate of speedand arranged to receive areflection of the said ray of light from the said first mentioned mirror, and a means for determinin the position of the said ray of light as re ectedfrom the said second mirror.

2. An apparatus as specified in claim 1, in

noo v which the second mirror is carried by the In testimony whereof I have aixed my rotating axis of a normal meter running at signature in presence of two witnesses. a predetermined rate of speed.

3. An apparatus as specified in claim 1, in K. R. IHAMUOTILA. 5 which the said source of light consists of an Witnesses:

electric incandescent lamp included in the K. A. KosmNmN,

said supplementary electric circuit. O. TUOMINEN. 

